bus/ifpga: fix build for cpp applications
bus/ifpga: fix build for cpp applications

Brackets unmatch when __cplusplus defined.

Fixes: 05fa3d4a6539 ("bus/ifpga: add Intel FPGA bus library")
Cc: stable@dpdk.org

Signed-off-by: Andy Pei <495968cb2b3cf2ab5bd53dc54ba9a3450dc45709@intel.com>
Reviewed-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk